This is a three chamber dual tone whistle. It gets loud quick and gets louder the harder you blow. I designed it as a replacement for a friend who was looking for a 3D printed whistle as loud as his current one used for Refereeing. If you love the whistle consider donating, thanks!
Update: added non handle version with a loop
Update 2: added easier printing version /added mouth grip
Update 3: Added V3 Version so printing orientation is upside down rather than side

Print with NO support, i find that and support pieces left behind ruin the sound. Also print at least at .2mm or finer.